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DAC1282, DAC1282A

SBAS490B – DECEMBER 2011 – REVISED MAY 2015

DAC1282 Low Distortion Digital-to-Analog Converter for Seismic

1 Features

3 Description

The DAC1282 is a fully-integrated digital-to-analog

1

•

Single-Chip Test Signal Generator

converter (DAC) providing low distortion, digital

•

Buffered Voltage Output

synthesized voltage output suitable for testing of

•

High Performance:

seismic equipment. The DAC1282 achieves very high

performance in a small package with low power.

–

THD: –125 dB (G = 1/1 to 1/8)

Together, with the high-performance ADS1281 and

–

SNR: 120 dB (413 Hz BW, G = 1/1)

ADS1282 analog-to-digital converters (ADCs), these

•

Analog and Digital Gain Control

devices create a measurement system that meets the

exacting

demands

of

seismic

data

acquisition

•

Output Frequency: 0.488 Hz to 250 Hz

equipment.

•

Sine, Pulse, and DC Modes

The DAC1282 integrates a digital signal generator, a

•

Digital Data Input Mode

DAC, and an output amplifier providing sine wave, dc,

•

Low On-Resistance Signal Switch

and pulse output voltages.

•

Sync Input

The output frequency is programmable from 0.5 Hz to

•

Power-Down Mode

250 Hz and the magnitude is scaled by both analog

•

Analog Supply: 5 V or ±2.5 V

and digital control. The analog gain is adjustable in 6-

dB steps and the digital gain in 0.5-dB steps. The

•

Digital Supply: 1.8 V to 3.3 V

analog gain settings match those of the ADS1282 for

•

Power: 38 mW

testing at all gains with high resolution.

•

Package: TSSOP-24

The DAC1282 also provides pulse outputs. The pulse

•

Operating Range: –50°C to +125°C

amplitude is user-programmed and then selected by

the pin for precise timing. Custom output signals can

2 Applications

be generated by applying an external bitstream

•

Energy Exploration

pattern.

•

Seismic Monitoring Systems

A signal switch can be used to connect the DAC

output to sensors for THD and impulse testing. The

•

High-Accuracy Instrumentation

switch timing is controlled by pin and by command.

A SYNC pin synchronizes the DAC output to the

analog-to-digital converter (ADC) sample interval. A

power-down input disables the device, reducing

power consumption to microwatts.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.